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Keysight M8040A High-Performance BERT Getting Started Guide
3
Using the M8040A High-Performance BERT
11 Click on
Data Out
corresponding to the M8045A (M1) and select the
line coding PAM-4.
Figure 26
Select line coding
12
Click on
Clk Gen
corresponding to the M8045A (M1) and set
the
frequency
as 10 GHz.
13 Click on
Data In
corresponding to the M8046A (M2) and select the line
coding PAM-4.
14 Enable the output of the pattern generator by clicking on the
Output
State
button as shown in
Figure 27
Enable pattern generator output
NOTE
In the CLK/2 mode, for symbol rates above 25 GBaud, an external
bandpass filter has to be used on the clock input of M8046A. The filter
has to be removed for symbol rates below 25 GBaud. However, in the
CLK/1 mode, no external bandpass filter is required.
NOTE
When the line coding “PAM-4” is selected for the loopback mode, it is
recommended to adjust the pattern generator data output de-emphasis
for the post cursor for error free operation (e.g. +0.05 at 25 Gbaud).
